A series compensation direct torque control method for open-winding permanent magnet synchronous motor

Abstract

The invention disclose a serial compensation direct torque control method for a winding permanent magnetic synchronous motor. Through cooperation control of a main converter and a compensation converter, the main converter bears most active power and necessary reactive power; and the compensation converter bears most reactive power and necessary active power, and the power factor of the main converter is enabled to be close to one or reach one. By using a direct torque control method, during a weak magnetic control process, the actual situations that the main converter simultaneously bears a part of reactive power and DC bus voltages and capacitance voltages may change are taken into consideration, and a weak magnetic control method of voltage feedback of the main converter is employed during the weak magnetic control process, such that the weak magnetic work area of a motor is effectively expanded, and the operation scope of the motor is enlarged.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a series compensation direct torque control method of an open-winding permanent magnet synchronous motor. Background technique [0002] Permanent magnet motors have high power density, high operating efficiency, simple structure, small size, light weight, and stable operation. They have been widely used in electric locomotives, electric vehicles, aerospace, national defense and other fields. However, since the permanent magnet motor adopts permanent magnet excitation, it is difficult to increase the speed by weakening the magnetic field, and the operating range is narrow, which limits the application of the permanent magnet motor in electric traction. The current common solution is to improve the design of the motor, but the operating efficiency and performance of the motor will be reduced to varying degrees. Therefore, it is necessary to find a topology and co...

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Problems solved by technology

[0005] However, in the flux-weakening calculation module of this patent, the calculation of the maximum voltage only considers the specific situation that the main converter provides all the active power and the compensation converter provides all the reactive power, and it is assumed that the DC bus voltage and capacitor voltage are constant

However, in actual control, the main converter may bear part of the reactive power at the same time, and the DC bus voltage, especially the capacitor voltage, may change. Therefore, this control method realizes the effective control of the open-winding permanent magnet synchronous motor, but the control The effect is not optimal

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